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半值厚度 bànzhí hòudù
avia.	half value thickness (指吸收体)
chem.	half-thickness; half-value layer
el.	half value thickness
met.	half-value thickness
space	half value thickness (吸收体的)
tech.	thickness of half value
半值〔半吸收，强度减半〕厚度
earth.sc.	half-value thickness

半值厚度: 2 phrases in 2 subjects

Geophysics	1
Oil / petroleum	1